JPH09112183A - Construction method for lining hardened layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the sending-in work of a hardening material for the soil, by stabilizing the foundation of a lining arch necessary for the construction of a lining hardened layer by use of superfluous slime discharged by a high pressure jet. SOLUTION: An injection rod 11 is inserted to a specified position of a tunnel face 1 while jetting water supplying to the injection rod 11 through a swivel 8 is jetted from a nozzle 13. A valve is changed over at a specified depth to send a hardening material of soil like high pressure cement milk generated by a high pressure pump to the injection rod 11 through a high pressure hose 10 and the swivel 8. In this way, the hardening material of soil is injected from the jetting nozzle 13 of the front end of the injection rod 11 and at the same time, the ground is cut with the jetting flow of the hardening material while rotating the injection rod 11 and retracting it and the hardening material is agitated and mixed with the peripheral soil to construct an injection layer 2 of the hardening material along the truck thereof. In this time, the hardening material saturated with the peripheral soil is discharged from the insertion opening as slime and stored in a slime pit 15.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to foundation hardening of a lining arch necessary for forming a lining hardened layer in an arch shape along a mirror surface circumference of a target ground when excavating a tunnel such as a tunnel.
The present invention relates to a lining hardened layer forming method that is performed by using excess slime discharged by high-pressure injection.

[0002]

Conventionally, in the formation of a lining hardened layer by high-pressure injection, surplus slime discharged at the time of high-pressure injection is processed by a squeezing device to be processed into a block shape and discharged, while the lining arch is covered. Ground hardening material injection work has been separately performed to solidify the foundation.

Therefore, an independent processing device and a disposal cost are required for the treatment of surplus slime that causes pollution, and a ground hardening material is additionally used for the foundation consolidation of the foundation that supports the weight of the lining arch. Since the injection work is required, the cost burden is doubled.

However, the surplus slime is originally discharged by saturating the ground hardening material into the target ground, and is not the ground hardening material used for the ground hardening material injection work to be performed on the foundation of the lining arch. On the one hand, there was a problem that the ground hardening material of the same quality as slime, which is of the same quality and which is difficult to discharge, must be carried in on the one hand to solidify the foundation of the lining arch.

[0005]

In order to solve the above problems, the present invention utilizes slime discharged at the time of injecting the ground hardening material for forming a lining hardened layer as the ground hardening material. By injecting into the foundation part of the lining arch and injecting the hardening material while performing the foundation hardening, the ground for the ground hardening material injection work to be performed separately for the treatment of surplus slime and the foundation hardening of the lining arch. The trouble of bringing in the hardened material can be saved at once.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 is a mirror surface of the target ground for which excavation such as a tunnel is planned. A beam-like ground hardening material injection layer 2 is arranged in an arch shape along the periphery of the ground to form a lining hardening layer, and the lower part is supported. It is to be supported by Engineering 19.

[0007] 3 is a construction machine for forming the hardening material injection layer 2,
An injection rod 11 having an injection nozzle 13 at its tip is supported by a drifter 12 having a mechanism for advancing, retracting, and rotating,
The injection rod 11 can be operated to move forward, backward, and rotate.

First, the mirror surface 1 of the target ground for which excavation is planned
The construction machine 3 is installed at the construction position for forming the lining hardened layer, and the injection rod 11 is inserted and perforated at a predetermined position on the mirror surface 1 while ejecting the water supplied to the injection rod 11 through the swivel 8 from the nozzle 13. High-pressure hose by switching the valve at a predetermined depth
10, the ground hardening material such as high-pressure cement milk generated by the high-pressure pump is sent to the injection rod 11 through the swivel 8.

In this way, while the ground hardening material is being injected at high pressure from the tip injection nozzle 13 of the injection rod 11, the injection rod is injected.
11 is rotated and retracted, the ground is cut by the ground hardening material jet, the ground hardening material is mixed with the surrounding soil and stirred, and the hardening material injection layer 2 is formed along the locus.

At this time, the hardened material that has reached a saturated state with the surrounding soil becomes slime and flows out from the insertion hole opening of the rod 11,
It is stored one after another in a slime pool 15 that is provided below the slime pool.

A mud pump 6 is installed in the slime pool 15 and is stored through a hose 7 connected to a swivel 18 of a main shaft 17 of an auger 5 of a foot drilling machine 4 equipped with an appropriate injection device, for example, a moving mechanism. The slime is sucked and supplied to the auger main shaft 17 of the punching machine 4.

The perforator 4 perforates the lining arch at a predetermined position forming a foundation of the lining arch by the auger 5 and, at the time of pulling up, injects slime through the ejection holes 20 provided in the auger main shaft 17 to the foundation. Create a solid body 16.

The solidified bodies 16 thus formed are arranged in parallel one after another to solidify the foundation of the lining arch. The solidified materials forming the solidified body 16 are parallel to each other. Since it is discharged one after another as the hardening material injection layer 2 is formed, it is not necessary to supply specially, and at the same time, the slime treatment accompanying the formation of the hardening material injection layer 2 is performed. All steps are unnecessary.

[0014]

[Brief description of the drawings]

FIG. 1 is an overall side view showing a construction situation according to an embodiment of the present invention.

FIG. 2 is a front view of the construction status taken along the line XX in FIG.

[Explanation of symbols]

 1 Mirror surface of the target ground 2 Hardening material injection layer 3 Construction machine 4 Drilling machine 5 Auger 6 Mud pump 7 Hose 8 Swivel 9 Slime 10 High pressure hose 11 Injection rod 12 Drifter 13 Injection nozzle 14 Beam-shaped hardening body 15 Slime pool 16 Solid body 17 Auger Spindle 18 Drilling Swivel 19 Support 20 Drilling hole of punching spindle

Claims (1)

[Claims] 1. A beam formed by inserting an injection rod having an injection nozzle at its tip into the target ground, and rotating and retracting the rod while injecting the ground hardening material as a high-pressure jet from the injection nozzle at a predetermined depth. In the construction method of the lining hardened layer in which the layer-shaped ground hardening material injection layers are arranged side by side in an arch shape, the slime discharged during the injection of the beam-shaped ground hardening material is injected into the foundation part of the lining arch to solidify the foundation. Hardened layer construction method characterized by